Are effects really not supported in IE/Quirksmode?

Are effects really not supported in IE/Quirksmode?


I don't use a lot of effects, so when I got the dreaded "flash of
content" in IE6 when trying to a slideUp/slideDown, I did some quick
searching to jog my memory.
Found this: http://dev.jquery.com/ticket/1726
This is the bug, and it's "wontfix" because IE/Quirksmode is not
supported for fx?
IE6/7 are still the dominant browser, and quirksmode is still how many
(most?) pages are operating (often out of our control). Is it not
supported simply because you can't come up with a good fix? IE6 has
been around for a decade, it's not rocket science! jQuery should
normalize browser behavior, not label common and perfectly valid
situations as "unsupported" simply because the fix requires some
additional work. That's a very disappointing approach to development,
IMO.
Matt Kruse